I have a 2001 SLT 4.7L that has a headlight flicker in the left bulb while on low beam. Doesn't occur on highbeam. I tried changing out the bulb, but that didn't change it. It does it while driving or stopped. It does while the engine is running or not, so I don't think its an alternator problem. The flicker isn't a constant on off. It will go off and stay off for extened periods of time, as well as stay on for multipule minutes. I am assuming it's a bad relay or ground, but asssume not a relay as that should affect both lights, not just one.

Any ideas, and I could use illustrations of what I am looking for. I know how to fix it once identified, just not what to look for to identifiy it.